就效率而言,操作系統(tǒng)將采用比RUN模式中所用分時(shí)值(通常每窗口約50ms)更長(zhǎng)些的分時(shí)值。351/352 CPU的鑰匙開(kāi)關(guān):改變方式和閃爍保護(hù)351 CPU有-鑰匙開(kāi)關(guān),此開(kāi)關(guān)在模塊的前方,可用于保護(hù)閃爍存儲(chǔ)器免遭改寫(xiě)。當(dāng)你將鑰匙轉(zhuǎn)動(dòng)至ON/RUN位置時(shí),如鑰匙不轉(zhuǎn)至OFF位,則無(wú)人能夠改變內(nèi)爍存儲(chǔ)器。從351 CPU和352 CPU的版本7開(kāi)始,鑰匙開(kāi)關(guān)還有另一項(xiàng)功能:即可將PLC切換至STOP方式和RUN方式以及清除非致命故障,這在下一節(jié)進(jìn)行討論。

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